** NOTE ON ALL ANIMATED GIFS PROVIDED BELOW: Please be aware that flashing areas larger than 21,824 square pixels can trigger seizures in people with photosensitive seizure disorders like photosensitive epilepsy.**

10. Crab Nebula
These images of the Crab Nebula show how extremely dense, rapidly rotating neutron stars produced when a massive star explodes can create clouds of high-energy particles light years across that glow brightly in X-rays.(Credit: NASA/CXC/A.Jubett)

11. Hercules A
Some galaxies have extremely bright cores, suggesting that they contain a supermassive black hole that is pulling in matter at a prodigious rate. Astronomers call these "active galaxies," and Hercules A is one of them.(Credit: NASA/CXC/A.Jubett)

12. Black Holes
Black Holes (def.): A dense, compact object whose gravitational pull is so strong that - within a certain distance of it - nothing can escape, not even light.(Credit: NASA/CXC/A.Jubett)

13. Supernovas
Supernova (def.): Explosive death of a star, caused by the sudden onset of nuclear burning in a white dwarf star, or gravitational collapse of the core of massive star followed by a shock wave that disrupts the star.(Credit: NASA/CXC/A.Jubett)

14. Cas A: Supernova Remnant in 3D
This visualization of Cassiopeia A shows that there are two main components to this supernova remnant: a spherical component in the outer parts of the remnant and a flattened (disk-like) component in the inner region.(Credit: NASA/CXC/A.Jubett)

15. SN 2006gy: An Exploding Star
The extremely massive star shed some of its outer layers in a large eruption prior to its violent collapse. The explosion then plows into the expelled cooler gas, creating a brilliant light show.(Credit: NASA/CXC/A.Jubett)

16. Black Hole Merger
This gif shows a merger of two galaxies that forms a single galaxy with two centrally located supermassive black holes surrounded by disks of hot gas. The black holes orbit each other for hundreds of millions of years before they merge to form a single supermassive black hole that sends out intense gravitational waves.(Credit: NASA/CXC/A.Jubett)

17. Chandra Spacecraft
On July 23, 1999, the Chandra X-ray Observatory was launched into orbit aboard the Space Shuttle Columbia. Chandra is one of NASA's four "Great Observatories," along with the Hubble Space Telescope, the Spitzer Space Telescope, and the Compton Gamma Ray Observatory.(Credit: NASA/CXC/A.Jubett)

18. Astronomy fact #1
There is a supermassive black hole in the center of our very own
Milky Way Galaxy. It is called Sagittarius A* and it is 26,000 light
years away from Earth.PDF(Credit: NASA/CXC/SAO)

19. Astronomy fact #2
If a baseball were made of neutron star material it would weigh about 20 trillion kg, or about 40 times the estimated weight of the entire human population.PDF(Credit: NASA/CXC/SAO)

21. Astronomy fact #4
A quasar radiates so much energy that if it was only the size of a flashlight it would produce as much light as all the houses and businesses in the entire Los Angeles basin!PDF(Credit: NASA/CXC/SAO)

24. Astronomy fact #7
Brown dwarfs weren't discovered until 1995 because they were so faint, but it is now estimated that in the Milky Way there are just as many as normal stars.PDF(Credit: NASA/CXC/SAO)

26. Astronomy fact #9
It is thought that the galaxy cluster Perseus is emanating sound waves in the note of B flat, 57 octaves below middle-C which is a million billion times deeper than the limits of human hearing.PDF(Credit: NASA/CXC/SAO)

27. Astronomy fact #10
In billions of years, when our Milky Way galaxy collides with the Andromeda galaxy, it is unlikely that any stars will collide because they are all so far apart from each other.PDF(Credit: NASA/CXC/SAO)